Okay, Master Gardener stepping up to the plate... I don't pretend to be smart, but I have good looks...I mean, books!!
Anyhoo, I was just reading about Arrowleaf Clover (Trifolium Vesiculosum). Latin names can eliminate alot of confusion when talking to a seed supplier.
Arrowleaf is good for growing in the south, including NC. It is a winter annual and has a long blooming season, 6-8 weeks longer than crimson clover (Trifolium Incarnatum L.) Arrowleaf can grow in sandy or clay soils. Its flower is white, which then turns pink and then purple. I think this one sounds promising to me and I think it is the one I'll invest in for my bees.
There is a seed supplier for clover on the internet. They have great descriptions and pictures of all the kinds of clover-- that's where I picked up all the fancy Latin names. If you google "clover types" and click on ampac seed co. you'll find alot of good info. And the pictures help alleviate any doubt about which clover you are thinking of. Common names can be very frustrating.
Nelly